Brainstorm

The idea of this brainstorm is to add an "automatic" option to the Backlight time-out menu in Display settings.

The backlight time-out could be set to automatic (e.g., between a minimal and maximal value). If the user taps the screen (or uses the screen lock switch) to turn the backlight back on right after it dimmed automatically, the interval until the next auto-dimming should increase (e.g., double). If the user does not attempt to bring the backlight back on, the next auto-dimming interval can be short (e.g., the minimal value can be utilized).

Solutions for this brainstorm

Solution #1: Double the interval on activity, return to minimum on inactivity

Allow automatic dimming interval between a minimal and maximal value. Double the dimming interval as long as user keeps bringing the backlight back on shortly after it dimmed automatically until the maximum value is reached. Use the minimum value again after a period of inactivity.

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Solution #2: Add accelerometer input as an option

If the accelerometer changes any value, however small, it would count as a "user tap". This way, just by holding the N900 in your hands to read something (or watch something) it won't turn of the screen.

Maybe add some options to turn off this feature, when the action is not desired.